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A Discontinuous Transmission of Speech Signal and Background Noise Generation Method

A technology for background noise and speech signals, which is applied in the field of discontinuous transmission technology and the generation of comfortable background noise, and can solve problems such as being unsuitable for mixed excitation linear prediction MELP vocoders.

Active Publication Date: 2016-04-06
CHONGQING UNIV OF POSTS & TELECOMM
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  • Claims
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Problems solved by technology

[0012] In addition, the current CNG algorithm is based on the background noise generation algorithm of the simplified code-excited linear prediction CELP (CodeExcitedLinearPrediction) model, which is not suitable for the vocoder using the mixed excitation linear prediction MELP (MixedExcitationLinearPrediction)

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  • A Discontinuous Transmission of Speech Signal and Background Noise Generation Method
  • A Discontinuous Transmission of Speech Signal and Background Noise Generation Method
  • A Discontinuous Transmission of Speech Signal and Background Noise Generation Method

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Embodiment Construction

[0023] In Embodiment 1 of the present invention, the entire discontinuous transmission process of the input speech signal is divided into three stages: a speech coding stage, a transition stage, and a noise coding stage. Each stage has its own frame type. The frame in the speech coding stage is the speech frame SPEECH, the frame in the transition stage is the transition frame SPEECH_H, and the frame in the noise coding stage has two types: silence description frame SID and non-transmission frame NO_TRANS.

[0024] The schematic diagram of the encoding and sending method of the SID frame is as follows: figure 2 shown. At the encoding end, the VAD algorithm is first used to judge whether the signal is a speech signal or a background noise signal. If it is a voice signal, it will enter the speech coding stage and work according to the normal speech coding method. If it is judged as a background noise signal, then the consecutive M frames starting from the first silent frame ar...

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Abstract

The invention relates to a method for discontinuous transmission of voice signals and generation of background noise. The method comprises the steps that a transition frame is added when a voice frame is converted into a mute frame, and the frequency for sending a mute description frame is determined according to the size of fluctuating values of the background noise in the mute frame; at a decoding end, white noise is used as stimulus signals, and after a linear predictive coding resulting filter is passed through, comfortable noise is obtained through gain adjustment. The method for the discontinuous transmission of the voice signals and the generation of the background noise has good adaptivity when used for transmitting noise signals, and composite background noise has good continuity and comfortableness in subjective auditory sense.

Description

technical field [0001] The invention relates to the field of voice communication, more specifically, to a discontinuous transmission technology in voice coding and a method for generating comfortable background noise. Background technique [0002] In the process of voice communication, voice compression coding technology can reduce the bandwidth required for transmitting voice signals and increase the capacity of the communication system. Human beings do not speak for about 70% of the time during voice communication. If voice coding is always performed at one rate, it will be a waste of transmission channel resources, and channel resources are used in the communication field, especially in the wireless communication field. is extremely precious. [0003] In the prior art, in order to reduce this waste of resources, transmitted voice signal frames are divided into two types: voice frames and silent frames. Since the receiving end is concerned with the useful voice signal, t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L19/012
Inventor 李强谢虹恩张小红郑秋菊王丽珍夏绪玖明艳李云
Owner CHONGQING UNIV OF POSTS & TELECOMM
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